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A boy standing on a weighing machine obs...

A boy standing on a weighing machine observes his weight as 200 N. When he suddenly jumpes upwards, his friend notices that the reading increased to 400 N. The acceleration by which the boy jumped will be-

A

`9.8m//s^(2)`

B

`29.4m//s^(2)`

C

`4.9m//s^(2)`

D

`14.7m//s^(2)`

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Knowledge Check

  • A boy standing on a weighing machine notices his wight as 400 N. When he suddenly jumps upward the weight shown by the machine becomes 600 N. The acceleration with which the boy jumps up is : (Take g=10m//s^(2) )

    A
    `5 ms^(-2)`
    B
    `3.4 ms^(-2)`
    C
    `6 ms^(-2)`
    D
    `9.8 ms^(-2)`

  • A spring toy weighing 1 kg on a spring balance suddenly jumps upward. A boy standing near the toy notices that the scale of the balance reads 1.05 kg. In this process the maximum acceleration of the toy is - (g = 10 m sec^(–2))

    A
    `0.05" m sec"^(–2)`
    B
    `0.5" m sec"^(–2)`
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  • A body stands on a weighing machine inside a lift. When the lift is going down wit acceleration g//4 , the machine shows a reading 30 kg. When the lift goes upwards with acceleration g//4 , the reading would be

    A
    18 k
    B
    37.5 kg
    C
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